Collapsible rack



FIG. 1 is a perspective view of a collapsible rack embodying my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a front elevational view thereof, in its closed position;

FIG. 6 is a top plan view thereof of FIG. 5; and,

FIG. 7 is a bottom plan view of FIG. 5. 

The ornamental design for a collapsible rack, as shown and described. 